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1/*
2 hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
3
4 This file defines the sysfs class "hwmon", for use by sensors drivers.
5
6 Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; version 2 of the License.
11*/
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/err.h>
18#include <linux/kdev_t.h>
19#include <linux/idr.h>
20#include <linux/hwmon.h>
21#include <linux/gfp.h>
22#include <linux/spinlock.h>
23#include <linux/pci.h>
24
25#define HWMON_ID_PREFIX "hwmon"
26#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
27
28static struct class *hwmon_class;
29
30static DEFINE_IDR(hwmon_idr);
31static DEFINE_SPINLOCK(idr_lock);
32
33/**
34 * hwmon_device_register - register w/ hwmon
35 * @dev: the device to register
36 *
37 * hwmon_device_unregister() must be called when the device is no
38 * longer needed.
39 *
40 * Returns the pointer to the new device.
41 */
42struct device *hwmon_device_register(struct device *dev)
43{
44 struct device *hwdev;
45 int id, err;
46
47again:
48 if (unlikely(idr_pre_get(&hwmon_idr, GFP_KERNEL) == 0))
49 return ERR_PTR(-ENOMEM);
50
51 spin_lock(&idr_lock);
52 err = idr_get_new(&hwmon_idr, NULL, &id);
53 spin_unlock(&idr_lock);
54
55 if (unlikely(err == -EAGAIN))
56 goto again;
57 else if (unlikely(err))
58 return ERR_PTR(err);
59
60 id = id & MAX_ID_MASK;
61 hwdev = device_create(hwmon_class, dev, MKDEV(0, 0), NULL,
62 HWMON_ID_FORMAT, id);
63
64 if (IS_ERR(hwdev)) {
65 spin_lock(&idr_lock);
66 idr_remove(&hwmon_idr, id);
67 spin_unlock(&idr_lock);
68 }
69
70 return hwdev;
71}
72
73/**
74 * hwmon_device_unregister - removes the previously registered class device
75 *
76 * @dev: the class device to destroy
77 */
78void hwmon_device_unregister(struct device *dev)
79{
80 int id;
81
82 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
83 device_unregister(dev);
84 spin_lock(&idr_lock);
85 idr_remove(&hwmon_idr, id);
86 spin_unlock(&idr_lock);
87 } else
88 dev_dbg(dev->parent,
89 "hwmon_device_unregister() failed: bad class ID!\n");
90}
91
92static void __init hwmon_pci_quirks(void)
93{
94#if defined CONFIG_X86 && defined CONFIG_PCI
95 struct pci_dev *sb;
96 u16 base;
97 u8 enable;
98
99 /* Open access to 0x295-0x296 on MSI MS-7031 */
100 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
101 if (sb &&
102 (sb->subsystem_vendor == 0x1462 && /* MSI */
103 sb->subsystem_device == 0x0031)) { /* MS-7031 */
104
105 pci_read_config_byte(sb, 0x48, &enable);
106 pci_read_config_word(sb, 0x64, &base);
107
108 if (base == 0 && !(enable & BIT(2))) {
109 dev_info(&sb->dev,
110 "Opening wide generic port at 0x295\n");
111 pci_write_config_word(sb, 0x64, 0x295);
112 pci_write_config_byte(sb, 0x48, enable | BIT(2));
113 }
114 }
115#endif
116}
117
118static int __init hwmon_init(void)
119{
120 hwmon_pci_quirks();
121
122 hwmon_class = class_create(THIS_MODULE, "hwmon");
123 if (IS_ERR(hwmon_class)) {
124 pr_err("couldn't create sysfs class\n");
125 return PTR_ERR(hwmon_class);
126 }
127 return 0;
128}
129
130static void __exit hwmon_exit(void)
131{
132 class_destroy(hwmon_class);
133}
134
135subsys_initcall(hwmon_init);
136module_exit(hwmon_exit);
137
138EXPORT_SYMBOL_GPL(hwmon_device_register);
139EXPORT_SYMBOL_GPL(hwmon_device_unregister);
140
141MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
142MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
143MODULE_LICENSE("GPL");
144
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
4 *
5 * This file defines the sysfs class "hwmon", for use by sensors drivers.
6 *
7 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/bitops.h>
13#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/gfp.h>
16#include <linux/hwmon.h>
17#include <linux/idr.h>
18#include <linux/module.h>
19#include <linux/pci.h>
20#include <linux/slab.h>
21#include <linux/string.h>
22#include <linux/thermal.h>
23
24#define CREATE_TRACE_POINTS
25#include <trace/events/hwmon.h>
26
27#define HWMON_ID_PREFIX "hwmon"
28#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
29
30struct hwmon_device {
31 const char *name;
32 struct device dev;
33 const struct hwmon_chip_info *chip;
34
35 struct attribute_group group;
36 const struct attribute_group **groups;
37};
38
39#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
40
41#define MAX_SYSFS_ATTR_NAME_LENGTH 32
42
43struct hwmon_device_attribute {
44 struct device_attribute dev_attr;
45 const struct hwmon_ops *ops;
46 enum hwmon_sensor_types type;
47 u32 attr;
48 int index;
49 char name[MAX_SYSFS_ATTR_NAME_LENGTH];
50};
51
52#define to_hwmon_attr(d) \
53 container_of(d, struct hwmon_device_attribute, dev_attr)
54
55/*
56 * Thermal zone information
57 * In addition to the reference to the hwmon device,
58 * also provides the sensor index.
59 */
60struct hwmon_thermal_data {
61 struct hwmon_device *hwdev; /* Reference to hwmon device */
62 int index; /* sensor index */
63};
64
65static ssize_t
66name_show(struct device *dev, struct device_attribute *attr, char *buf)
67{
68 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
69}
70static DEVICE_ATTR_RO(name);
71
72static struct attribute *hwmon_dev_attrs[] = {
73 &dev_attr_name.attr,
74 NULL
75};
76
77static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
78 struct attribute *attr, int n)
79{
80 struct device *dev = container_of(kobj, struct device, kobj);
81
82 if (to_hwmon_device(dev)->name == NULL)
83 return 0;
84
85 return attr->mode;
86}
87
88static const struct attribute_group hwmon_dev_attr_group = {
89 .attrs = hwmon_dev_attrs,
90 .is_visible = hwmon_dev_name_is_visible,
91};
92
93static const struct attribute_group *hwmon_dev_attr_groups[] = {
94 &hwmon_dev_attr_group,
95 NULL
96};
97
98static void hwmon_dev_release(struct device *dev)
99{
100 kfree(to_hwmon_device(dev));
101}
102
103static struct class hwmon_class = {
104 .name = "hwmon",
105 .owner = THIS_MODULE,
106 .dev_groups = hwmon_dev_attr_groups,
107 .dev_release = hwmon_dev_release,
108};
109
110static DEFINE_IDA(hwmon_ida);
111
112/* Thermal zone handling */
113
114/*
115 * The complex conditional is necessary to avoid a cyclic dependency
116 * between hwmon and thermal_sys modules.
117 */
118#ifdef CONFIG_THERMAL_OF
119static int hwmon_thermal_get_temp(void *data, int *temp)
120{
121 struct hwmon_thermal_data *tdata = data;
122 struct hwmon_device *hwdev = tdata->hwdev;
123 int ret;
124 long t;
125
126 ret = hwdev->chip->ops->read(&hwdev->dev, hwmon_temp, hwmon_temp_input,
127 tdata->index, &t);
128 if (ret < 0)
129 return ret;
130
131 *temp = t;
132
133 return 0;
134}
135
136static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
137 .get_temp = hwmon_thermal_get_temp,
138};
139
140static int hwmon_thermal_add_sensor(struct device *dev,
141 struct hwmon_device *hwdev, int index)
142{
143 struct hwmon_thermal_data *tdata;
144 struct thermal_zone_device *tzd;
145
146 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
147 if (!tdata)
148 return -ENOMEM;
149
150 tdata->hwdev = hwdev;
151 tdata->index = index;
152
153 tzd = devm_thermal_zone_of_sensor_register(&hwdev->dev, index, tdata,
154 &hwmon_thermal_ops);
155 /*
156 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
157 * so ignore that error but forward any other error.
158 */
159 if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
160 return PTR_ERR(tzd);
161
162 return 0;
163}
164#else
165static int hwmon_thermal_add_sensor(struct device *dev,
166 struct hwmon_device *hwdev, int index)
167{
168 return 0;
169}
170#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
171
172static int hwmon_attr_base(enum hwmon_sensor_types type)
173{
174 if (type == hwmon_in)
175 return 0;
176 return 1;
177}
178
179/* sysfs attribute management */
180
181static ssize_t hwmon_attr_show(struct device *dev,
182 struct device_attribute *devattr, char *buf)
183{
184 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
185 long val;
186 int ret;
187
188 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
189 &val);
190 if (ret < 0)
191 return ret;
192
193 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
194 hattr->name, val);
195
196 return sprintf(buf, "%ld\n", val);
197}
198
199static ssize_t hwmon_attr_show_string(struct device *dev,
200 struct device_attribute *devattr,
201 char *buf)
202{
203 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
204 enum hwmon_sensor_types type = hattr->type;
205 const char *s;
206 int ret;
207
208 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
209 hattr->index, &s);
210 if (ret < 0)
211 return ret;
212
213 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
214 hattr->name, s);
215
216 return sprintf(buf, "%s\n", s);
217}
218
219static ssize_t hwmon_attr_store(struct device *dev,
220 struct device_attribute *devattr,
221 const char *buf, size_t count)
222{
223 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
224 long val;
225 int ret;
226
227 ret = kstrtol(buf, 10, &val);
228 if (ret < 0)
229 return ret;
230
231 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
232 val);
233 if (ret < 0)
234 return ret;
235
236 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
237 hattr->name, val);
238
239 return count;
240}
241
242static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
243{
244 return (type == hwmon_temp && attr == hwmon_temp_label) ||
245 (type == hwmon_in && attr == hwmon_in_label) ||
246 (type == hwmon_curr && attr == hwmon_curr_label) ||
247 (type == hwmon_power && attr == hwmon_power_label) ||
248 (type == hwmon_energy && attr == hwmon_energy_label) ||
249 (type == hwmon_humidity && attr == hwmon_humidity_label) ||
250 (type == hwmon_fan && attr == hwmon_fan_label);
251}
252
253static struct attribute *hwmon_genattr(struct device *dev,
254 const void *drvdata,
255 enum hwmon_sensor_types type,
256 u32 attr,
257 int index,
258 const char *template,
259 const struct hwmon_ops *ops)
260{
261 struct hwmon_device_attribute *hattr;
262 struct device_attribute *dattr;
263 struct attribute *a;
264 umode_t mode;
265 const char *name;
266 bool is_string = is_string_attr(type, attr);
267
268 /* The attribute is invisible if there is no template string */
269 if (!template)
270 return ERR_PTR(-ENOENT);
271
272 mode = ops->is_visible(drvdata, type, attr, index);
273 if (!mode)
274 return ERR_PTR(-ENOENT);
275
276 if ((mode & 0444) && ((is_string && !ops->read_string) ||
277 (!is_string && !ops->read)))
278 return ERR_PTR(-EINVAL);
279 if ((mode & 0222) && !ops->write)
280 return ERR_PTR(-EINVAL);
281
282 hattr = devm_kzalloc(dev, sizeof(*hattr), GFP_KERNEL);
283 if (!hattr)
284 return ERR_PTR(-ENOMEM);
285
286 if (type == hwmon_chip) {
287 name = template;
288 } else {
289 scnprintf(hattr->name, sizeof(hattr->name), template,
290 index + hwmon_attr_base(type));
291 name = hattr->name;
292 }
293
294 hattr->type = type;
295 hattr->attr = attr;
296 hattr->index = index;
297 hattr->ops = ops;
298
299 dattr = &hattr->dev_attr;
300 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
301 dattr->store = hwmon_attr_store;
302
303 a = &dattr->attr;
304 sysfs_attr_init(a);
305 a->name = name;
306 a->mode = mode;
307
308 return a;
309}
310
311/*
312 * Chip attributes are not attribute templates but actual sysfs attributes.
313 * See hwmon_genattr() for special handling.
314 */
315static const char * const hwmon_chip_attrs[] = {
316 [hwmon_chip_temp_reset_history] = "temp_reset_history",
317 [hwmon_chip_in_reset_history] = "in_reset_history",
318 [hwmon_chip_curr_reset_history] = "curr_reset_history",
319 [hwmon_chip_power_reset_history] = "power_reset_history",
320 [hwmon_chip_update_interval] = "update_interval",
321 [hwmon_chip_alarms] = "alarms",
322 [hwmon_chip_samples] = "samples",
323 [hwmon_chip_curr_samples] = "curr_samples",
324 [hwmon_chip_in_samples] = "in_samples",
325 [hwmon_chip_power_samples] = "power_samples",
326 [hwmon_chip_temp_samples] = "temp_samples",
327};
328
329static const char * const hwmon_temp_attr_templates[] = {
330 [hwmon_temp_input] = "temp%d_input",
331 [hwmon_temp_type] = "temp%d_type",
332 [hwmon_temp_lcrit] = "temp%d_lcrit",
333 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
334 [hwmon_temp_min] = "temp%d_min",
335 [hwmon_temp_min_hyst] = "temp%d_min_hyst",
336 [hwmon_temp_max] = "temp%d_max",
337 [hwmon_temp_max_hyst] = "temp%d_max_hyst",
338 [hwmon_temp_crit] = "temp%d_crit",
339 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
340 [hwmon_temp_emergency] = "temp%d_emergency",
341 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
342 [hwmon_temp_alarm] = "temp%d_alarm",
343 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
344 [hwmon_temp_min_alarm] = "temp%d_min_alarm",
345 [hwmon_temp_max_alarm] = "temp%d_max_alarm",
346 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
347 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
348 [hwmon_temp_fault] = "temp%d_fault",
349 [hwmon_temp_offset] = "temp%d_offset",
350 [hwmon_temp_label] = "temp%d_label",
351 [hwmon_temp_lowest] = "temp%d_lowest",
352 [hwmon_temp_highest] = "temp%d_highest",
353 [hwmon_temp_reset_history] = "temp%d_reset_history",
354};
355
356static const char * const hwmon_in_attr_templates[] = {
357 [hwmon_in_input] = "in%d_input",
358 [hwmon_in_min] = "in%d_min",
359 [hwmon_in_max] = "in%d_max",
360 [hwmon_in_lcrit] = "in%d_lcrit",
361 [hwmon_in_crit] = "in%d_crit",
362 [hwmon_in_average] = "in%d_average",
363 [hwmon_in_lowest] = "in%d_lowest",
364 [hwmon_in_highest] = "in%d_highest",
365 [hwmon_in_reset_history] = "in%d_reset_history",
366 [hwmon_in_label] = "in%d_label",
367 [hwmon_in_alarm] = "in%d_alarm",
368 [hwmon_in_min_alarm] = "in%d_min_alarm",
369 [hwmon_in_max_alarm] = "in%d_max_alarm",
370 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
371 [hwmon_in_crit_alarm] = "in%d_crit_alarm",
372 [hwmon_in_enable] = "in%d_enable",
373};
374
375static const char * const hwmon_curr_attr_templates[] = {
376 [hwmon_curr_input] = "curr%d_input",
377 [hwmon_curr_min] = "curr%d_min",
378 [hwmon_curr_max] = "curr%d_max",
379 [hwmon_curr_lcrit] = "curr%d_lcrit",
380 [hwmon_curr_crit] = "curr%d_crit",
381 [hwmon_curr_average] = "curr%d_average",
382 [hwmon_curr_lowest] = "curr%d_lowest",
383 [hwmon_curr_highest] = "curr%d_highest",
384 [hwmon_curr_reset_history] = "curr%d_reset_history",
385 [hwmon_curr_label] = "curr%d_label",
386 [hwmon_curr_alarm] = "curr%d_alarm",
387 [hwmon_curr_min_alarm] = "curr%d_min_alarm",
388 [hwmon_curr_max_alarm] = "curr%d_max_alarm",
389 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
390 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
391};
392
393static const char * const hwmon_power_attr_templates[] = {
394 [hwmon_power_average] = "power%d_average",
395 [hwmon_power_average_interval] = "power%d_average_interval",
396 [hwmon_power_average_interval_max] = "power%d_interval_max",
397 [hwmon_power_average_interval_min] = "power%d_interval_min",
398 [hwmon_power_average_highest] = "power%d_average_highest",
399 [hwmon_power_average_lowest] = "power%d_average_lowest",
400 [hwmon_power_average_max] = "power%d_average_max",
401 [hwmon_power_average_min] = "power%d_average_min",
402 [hwmon_power_input] = "power%d_input",
403 [hwmon_power_input_highest] = "power%d_input_highest",
404 [hwmon_power_input_lowest] = "power%d_input_lowest",
405 [hwmon_power_reset_history] = "power%d_reset_history",
406 [hwmon_power_accuracy] = "power%d_accuracy",
407 [hwmon_power_cap] = "power%d_cap",
408 [hwmon_power_cap_hyst] = "power%d_cap_hyst",
409 [hwmon_power_cap_max] = "power%d_cap_max",
410 [hwmon_power_cap_min] = "power%d_cap_min",
411 [hwmon_power_min] = "power%d_min",
412 [hwmon_power_max] = "power%d_max",
413 [hwmon_power_lcrit] = "power%d_lcrit",
414 [hwmon_power_crit] = "power%d_crit",
415 [hwmon_power_label] = "power%d_label",
416 [hwmon_power_alarm] = "power%d_alarm",
417 [hwmon_power_cap_alarm] = "power%d_cap_alarm",
418 [hwmon_power_min_alarm] = "power%d_min_alarm",
419 [hwmon_power_max_alarm] = "power%d_max_alarm",
420 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
421 [hwmon_power_crit_alarm] = "power%d_crit_alarm",
422};
423
424static const char * const hwmon_energy_attr_templates[] = {
425 [hwmon_energy_input] = "energy%d_input",
426 [hwmon_energy_label] = "energy%d_label",
427};
428
429static const char * const hwmon_humidity_attr_templates[] = {
430 [hwmon_humidity_input] = "humidity%d_input",
431 [hwmon_humidity_label] = "humidity%d_label",
432 [hwmon_humidity_min] = "humidity%d_min",
433 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
434 [hwmon_humidity_max] = "humidity%d_max",
435 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
436 [hwmon_humidity_alarm] = "humidity%d_alarm",
437 [hwmon_humidity_fault] = "humidity%d_fault",
438};
439
440static const char * const hwmon_fan_attr_templates[] = {
441 [hwmon_fan_input] = "fan%d_input",
442 [hwmon_fan_label] = "fan%d_label",
443 [hwmon_fan_min] = "fan%d_min",
444 [hwmon_fan_max] = "fan%d_max",
445 [hwmon_fan_div] = "fan%d_div",
446 [hwmon_fan_pulses] = "fan%d_pulses",
447 [hwmon_fan_target] = "fan%d_target",
448 [hwmon_fan_alarm] = "fan%d_alarm",
449 [hwmon_fan_min_alarm] = "fan%d_min_alarm",
450 [hwmon_fan_max_alarm] = "fan%d_max_alarm",
451 [hwmon_fan_fault] = "fan%d_fault",
452};
453
454static const char * const hwmon_pwm_attr_templates[] = {
455 [hwmon_pwm_input] = "pwm%d",
456 [hwmon_pwm_enable] = "pwm%d_enable",
457 [hwmon_pwm_mode] = "pwm%d_mode",
458 [hwmon_pwm_freq] = "pwm%d_freq",
459};
460
461static const char * const *__templates[] = {
462 [hwmon_chip] = hwmon_chip_attrs,
463 [hwmon_temp] = hwmon_temp_attr_templates,
464 [hwmon_in] = hwmon_in_attr_templates,
465 [hwmon_curr] = hwmon_curr_attr_templates,
466 [hwmon_power] = hwmon_power_attr_templates,
467 [hwmon_energy] = hwmon_energy_attr_templates,
468 [hwmon_humidity] = hwmon_humidity_attr_templates,
469 [hwmon_fan] = hwmon_fan_attr_templates,
470 [hwmon_pwm] = hwmon_pwm_attr_templates,
471};
472
473static const int __templates_size[] = {
474 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
475 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
476 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
477 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
478 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
479 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
480 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
481 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
482 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
483};
484
485static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
486{
487 int i, n;
488
489 for (i = n = 0; info->config[i]; i++)
490 n += hweight32(info->config[i]);
491
492 return n;
493}
494
495static int hwmon_genattrs(struct device *dev,
496 const void *drvdata,
497 struct attribute **attrs,
498 const struct hwmon_ops *ops,
499 const struct hwmon_channel_info *info)
500{
501 const char * const *templates;
502 int template_size;
503 int i, aindex = 0;
504
505 if (info->type >= ARRAY_SIZE(__templates))
506 return -EINVAL;
507
508 templates = __templates[info->type];
509 template_size = __templates_size[info->type];
510
511 for (i = 0; info->config[i]; i++) {
512 u32 attr_mask = info->config[i];
513 u32 attr;
514
515 while (attr_mask) {
516 struct attribute *a;
517
518 attr = __ffs(attr_mask);
519 attr_mask &= ~BIT(attr);
520 if (attr >= template_size)
521 return -EINVAL;
522 a = hwmon_genattr(dev, drvdata, info->type, attr, i,
523 templates[attr], ops);
524 if (IS_ERR(a)) {
525 if (PTR_ERR(a) != -ENOENT)
526 return PTR_ERR(a);
527 continue;
528 }
529 attrs[aindex++] = a;
530 }
531 }
532 return aindex;
533}
534
535static struct attribute **
536__hwmon_create_attrs(struct device *dev, const void *drvdata,
537 const struct hwmon_chip_info *chip)
538{
539 int ret, i, aindex = 0, nattrs = 0;
540 struct attribute **attrs;
541
542 for (i = 0; chip->info[i]; i++)
543 nattrs += hwmon_num_channel_attrs(chip->info[i]);
544
545 if (nattrs == 0)
546 return ERR_PTR(-EINVAL);
547
548 attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
549 if (!attrs)
550 return ERR_PTR(-ENOMEM);
551
552 for (i = 0; chip->info[i]; i++) {
553 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
554 chip->info[i]);
555 if (ret < 0)
556 return ERR_PTR(ret);
557 aindex += ret;
558 }
559
560 return attrs;
561}
562
563static struct device *
564__hwmon_device_register(struct device *dev, const char *name, void *drvdata,
565 const struct hwmon_chip_info *chip,
566 const struct attribute_group **groups)
567{
568 struct hwmon_device *hwdev;
569 struct device *hdev;
570 int i, j, err, id;
571
572 /* Complain about invalid characters in hwmon name attribute */
573 if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
574 dev_warn(dev,
575 "hwmon: '%s' is not a valid name attribute, please fix\n",
576 name);
577
578 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
579 if (id < 0)
580 return ERR_PTR(id);
581
582 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
583 if (hwdev == NULL) {
584 err = -ENOMEM;
585 goto ida_remove;
586 }
587
588 hdev = &hwdev->dev;
589
590 if (chip) {
591 struct attribute **attrs;
592 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
593
594 if (groups)
595 for (i = 0; groups[i]; i++)
596 ngroups++;
597
598 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
599 GFP_KERNEL);
600 if (!hwdev->groups) {
601 err = -ENOMEM;
602 goto free_hwmon;
603 }
604
605 attrs = __hwmon_create_attrs(dev, drvdata, chip);
606 if (IS_ERR(attrs)) {
607 err = PTR_ERR(attrs);
608 goto free_hwmon;
609 }
610
611 hwdev->group.attrs = attrs;
612 ngroups = 0;
613 hwdev->groups[ngroups++] = &hwdev->group;
614
615 if (groups) {
616 for (i = 0; groups[i]; i++)
617 hwdev->groups[ngroups++] = groups[i];
618 }
619
620 hdev->groups = hwdev->groups;
621 } else {
622 hdev->groups = groups;
623 }
624
625 hwdev->name = name;
626 hdev->class = &hwmon_class;
627 hdev->parent = dev;
628 hdev->of_node = dev ? dev->of_node : NULL;
629 hwdev->chip = chip;
630 dev_set_drvdata(hdev, drvdata);
631 dev_set_name(hdev, HWMON_ID_FORMAT, id);
632 err = device_register(hdev);
633 if (err)
634 goto free_hwmon;
635
636 if (dev && dev->of_node && chip && chip->ops->read &&
637 chip->info[0]->type == hwmon_chip &&
638 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
639 const struct hwmon_channel_info **info = chip->info;
640
641 for (i = 1; info[i]; i++) {
642 if (info[i]->type != hwmon_temp)
643 continue;
644
645 for (j = 0; info[i]->config[j]; j++) {
646 if (!chip->ops->is_visible(drvdata, hwmon_temp,
647 hwmon_temp_input, j))
648 continue;
649 if (info[i]->config[j] & HWMON_T_INPUT) {
650 err = hwmon_thermal_add_sensor(dev,
651 hwdev, j);
652 if (err) {
653 device_unregister(hdev);
654 /*
655 * Don't worry about hwdev;
656 * hwmon_dev_release(), called
657 * from device_unregister(),
658 * will free it.
659 */
660 goto ida_remove;
661 }
662 }
663 }
664 }
665 }
666
667 return hdev;
668
669free_hwmon:
670 kfree(hwdev);
671ida_remove:
672 ida_simple_remove(&hwmon_ida, id);
673 return ERR_PTR(err);
674}
675
676/**
677 * hwmon_device_register_with_groups - register w/ hwmon
678 * @dev: the parent device
679 * @name: hwmon name attribute
680 * @drvdata: driver data to attach to created device
681 * @groups: List of attribute groups to create
682 *
683 * hwmon_device_unregister() must be called when the device is no
684 * longer needed.
685 *
686 * Returns the pointer to the new device.
687 */
688struct device *
689hwmon_device_register_with_groups(struct device *dev, const char *name,
690 void *drvdata,
691 const struct attribute_group **groups)
692{
693 if (!name)
694 return ERR_PTR(-EINVAL);
695
696 return __hwmon_device_register(dev, name, drvdata, NULL, groups);
697}
698EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
699
700/**
701 * hwmon_device_register_with_info - register w/ hwmon
702 * @dev: the parent device
703 * @name: hwmon name attribute
704 * @drvdata: driver data to attach to created device
705 * @chip: pointer to hwmon chip information
706 * @extra_groups: pointer to list of additional non-standard attribute groups
707 *
708 * hwmon_device_unregister() must be called when the device is no
709 * longer needed.
710 *
711 * Returns the pointer to the new device.
712 */
713struct device *
714hwmon_device_register_with_info(struct device *dev, const char *name,
715 void *drvdata,
716 const struct hwmon_chip_info *chip,
717 const struct attribute_group **extra_groups)
718{
719 if (!name)
720 return ERR_PTR(-EINVAL);
721
722 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
723 return ERR_PTR(-EINVAL);
724
725 if (chip && !dev)
726 return ERR_PTR(-EINVAL);
727
728 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
729}
730EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
731
732/**
733 * hwmon_device_register - register w/ hwmon
734 * @dev: the device to register
735 *
736 * hwmon_device_unregister() must be called when the device is no
737 * longer needed.
738 *
739 * Returns the pointer to the new device.
740 */
741struct device *hwmon_device_register(struct device *dev)
742{
743 dev_warn(dev,
744 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
745
746 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
747}
748EXPORT_SYMBOL_GPL(hwmon_device_register);
749
750/**
751 * hwmon_device_unregister - removes the previously registered class device
752 *
753 * @dev: the class device to destroy
754 */
755void hwmon_device_unregister(struct device *dev)
756{
757 int id;
758
759 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
760 device_unregister(dev);
761 ida_simple_remove(&hwmon_ida, id);
762 } else
763 dev_dbg(dev->parent,
764 "hwmon_device_unregister() failed: bad class ID!\n");
765}
766EXPORT_SYMBOL_GPL(hwmon_device_unregister);
767
768static void devm_hwmon_release(struct device *dev, void *res)
769{
770 struct device *hwdev = *(struct device **)res;
771
772 hwmon_device_unregister(hwdev);
773}
774
775/**
776 * devm_hwmon_device_register_with_groups - register w/ hwmon
777 * @dev: the parent device
778 * @name: hwmon name attribute
779 * @drvdata: driver data to attach to created device
780 * @groups: List of attribute groups to create
781 *
782 * Returns the pointer to the new device. The new device is automatically
783 * unregistered with the parent device.
784 */
785struct device *
786devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
787 void *drvdata,
788 const struct attribute_group **groups)
789{
790 struct device **ptr, *hwdev;
791
792 if (!dev)
793 return ERR_PTR(-EINVAL);
794
795 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
796 if (!ptr)
797 return ERR_PTR(-ENOMEM);
798
799 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
800 if (IS_ERR(hwdev))
801 goto error;
802
803 *ptr = hwdev;
804 devres_add(dev, ptr);
805 return hwdev;
806
807error:
808 devres_free(ptr);
809 return hwdev;
810}
811EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
812
813/**
814 * devm_hwmon_device_register_with_info - register w/ hwmon
815 * @dev: the parent device
816 * @name: hwmon name attribute
817 * @drvdata: driver data to attach to created device
818 * @chip: pointer to hwmon chip information
819 * @groups: pointer to list of driver specific attribute groups
820 *
821 * Returns the pointer to the new device. The new device is automatically
822 * unregistered with the parent device.
823 */
824struct device *
825devm_hwmon_device_register_with_info(struct device *dev, const char *name,
826 void *drvdata,
827 const struct hwmon_chip_info *chip,
828 const struct attribute_group **groups)
829{
830 struct device **ptr, *hwdev;
831
832 if (!dev)
833 return ERR_PTR(-EINVAL);
834
835 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
836 if (!ptr)
837 return ERR_PTR(-ENOMEM);
838
839 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
840 groups);
841 if (IS_ERR(hwdev))
842 goto error;
843
844 *ptr = hwdev;
845 devres_add(dev, ptr);
846
847 return hwdev;
848
849error:
850 devres_free(ptr);
851 return hwdev;
852}
853EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
854
855static int devm_hwmon_match(struct device *dev, void *res, void *data)
856{
857 struct device **hwdev = res;
858
859 return *hwdev == data;
860}
861
862/**
863 * devm_hwmon_device_unregister - removes a previously registered hwmon device
864 *
865 * @dev: the parent device of the device to unregister
866 */
867void devm_hwmon_device_unregister(struct device *dev)
868{
869 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
870}
871EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
872
873static void __init hwmon_pci_quirks(void)
874{
875#if defined CONFIG_X86 && defined CONFIG_PCI
876 struct pci_dev *sb;
877 u16 base;
878 u8 enable;
879
880 /* Open access to 0x295-0x296 on MSI MS-7031 */
881 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
882 if (sb) {
883 if (sb->subsystem_vendor == 0x1462 && /* MSI */
884 sb->subsystem_device == 0x0031) { /* MS-7031 */
885 pci_read_config_byte(sb, 0x48, &enable);
886 pci_read_config_word(sb, 0x64, &base);
887
888 if (base == 0 && !(enable & BIT(2))) {
889 dev_info(&sb->dev,
890 "Opening wide generic port at 0x295\n");
891 pci_write_config_word(sb, 0x64, 0x295);
892 pci_write_config_byte(sb, 0x48,
893 enable | BIT(2));
894 }
895 }
896 pci_dev_put(sb);
897 }
898#endif
899}
900
901static int __init hwmon_init(void)
902{
903 int err;
904
905 hwmon_pci_quirks();
906
907 err = class_register(&hwmon_class);
908 if (err) {
909 pr_err("couldn't register hwmon sysfs class\n");
910 return err;
911 }
912 return 0;
913}
914
915static void __exit hwmon_exit(void)
916{
917 class_unregister(&hwmon_class);
918}
919
920subsys_initcall(hwmon_init);
921module_exit(hwmon_exit);
922
923MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
924MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
925MODULE_LICENSE("GPL");
926